Cotton stalk papermaking pulping system
By using enzymatic hydrolysis and low-concentration alkaline cooking processes in the cotton stalk papermaking pulping system, the problem of high pectin content in cotton stalks has been solved, achieving efficient pectin removal and low-cost pulping, improving paper quality and reducing environmental pollution.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-16
- Publication Date
- 2026-04-03
AI Technical Summary
The high pectin content in cotton stalks leads to high consumption of chemicals and steam per ton of pulp, resulting in poor paper quality. Traditional high-concentration alkaline pulping also causes excessively high COD in wastewater, resulting in high treatment costs and serious environmental pollution.
A cotton stalk papermaking pulping system is adopted, including a material preparation section, an enzymatic hydrolysis section, and a cooking section. Using equipment such as a screw extruder, a twin-screw filament shredder, and an enzymatic hydrolysis reaction chamber, pectin is degraded through enzymatic hydrolysis and low-concentration alkali cooking, thereby reducing cellulose loss and improving lignin removal efficiency.
It achieved a pectin removal rate of ≥95% for cotton stalk raw materials, reduced pulping costs, decreased steam and chemical consumption, improved paper quality, and solved the environmental pollution problem caused by high-concentration alkaline pulping.
Smart Images
Figure CN224077845U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of pulp and paper making technology, and in particular to a cotton stalk pulping system for papermaking. Background Technology
[0002] For a long time, the raw material problem has severely restricted the development of the pulp and paper industry. There is a serious shortage of raw materials, with an abundance of grass and a scarcity of wood. Cotton stalks, as a high-quality raw material for papermaking, have been highly valued by major paper companies.
[0003] However, the high pectin content in cotton stalks has led to high consumption of chemicals and steam per ton of pulp, as well as issues with the quality of cotton stalk pulp making and paper production. These factors have become important constraints on its use as a raw material for pulping and papermaking. Traditional cotton stalk pulping technology relies on high-concentration alkali cooking to remove pectin and lignin, which has problems such as high energy consumption and excessive COD in wastewater.
[0004] Breaking the "sandwich structure" (pectin-hemicellulose-lignin complex) formed by pectin, hemicellulose, and lignin in cotton stalks, reducing cellulose loss while removing pectin, and increasing lignin removal, solves the problems of difficult impregnation and softening and poor uniformity caused by the natural resistance of cotton stalk bast fiber cell walls to biological enzymes. It also urgently addresses the problems of high COD in wastewater, high treatment costs, and serious environmental pollution caused by high concentrations of NaOH in traditional high-concentration alkaline pulping. Utility Model Content
[0005] In view of this, the present invention provides a cotton stalk papermaking pulping system, the main purpose of which is to degrade pectin in cotton stalks while reducing dependence on high concentrations of alkali.
[0006] To achieve the above objectives, this utility model mainly provides the following technical solutions:
[0007] On the one hand, this utility model provides a cotton stalk papermaking pulping system, which includes: a material preparation section, an enzymatic hydrolysis section, and a cooking section;
[0008] The material preparation section includes a wet material preparation unit, a screw extruder, and a twin-screw wire rolling machine connected in sequence.
[0009] The enzymatic hydrolysis section includes a hot spiral conveyor mechanism, a mixing and lifting spiral conveyor mechanism, and an enzymatic hydrolysis reaction chamber connected in sequence. The mixing and lifting spiral conveyor mechanism is connected to the enzyme preparation mixing tank.
[0010] The cooking section includes a material collection screw conveyor, a bucket elevator, a feeding screw conveyor, a cooking tube mechanism, a discharge device, and a spray chamber connected in sequence.
[0011] The purpose of this utility model and the technical problems to be solved can be further achieved by the following technical measures.
[0012] Optionally, the wet preparation unit includes a multi-roller grass washer and an inclined spiral dewatering machine connected in sequence.
[0013] Optionally, the screw extruder includes a first housing and two screws located inside the first housing. The direction from the material inlet of the first housing to the material outlet of the first housing is a first direction. Along the first direction, the diameter of the screws gradually increases, the pitch of the screw blades of the screws gradually decreases, and a first filter screen is provided below the screws.
[0014] Optionally, the twin-screw wire rolling machine includes a second housing and two wire rolling screws located inside the second housing. A horizontal screw and a vertical screw are sequentially arranged in the feed channel at the upper end of the second housing. A second filter screen is provided below the wire rolling screws, and a drain outlet is provided below the second filter screen.
[0015] Optionally, a steam pipeline is also included, one end of which is connected to the upper exhaust port of the discharge chamber, and the other end is connected to the hot spiral conveyor mechanism.
[0016] Optionally, the feeding screw conveying mechanism includes a third housing and a feeding screw located inside the third housing. A third filter screen is provided below the feeding screw. The drain outlet of the third housing below the third filter screen is connected to the enzyme preparation mixing tank. The discharge port of the third housing is connected to the inlet of the cooking tube mechanism. The inlet of the cooking tube mechanism is connected to the alkali spray pipe.
[0017] Optionally, the cooking section further includes a return screw mechanism, a pin drum metering device, and a pre-steaming screw mechanism. The outlet of the bucket elevator is connected to the inlet of the return screw mechanism, the middle outlet of the return screw mechanism is connected to the inlet of the pin drum metering device, the end outlet of the return screw mechanism is connected to the enzymatic reaction chamber, the outlet of the pin drum metering device is connected to the inlet of the pre-steaming screw mechanism, and the outlet of the pre-steaming screw mechanism is connected to the inlet of the feeding screw conveyor mechanism.
[0018] Optionally, the enzymatic hydrolysis section further includes an enzyme preparation pump, the inlet of which is connected to the enzyme preparation mixing tank, and the outlet of which is connected to the mixing and lifting screw conveyor mechanism.
[0019] On the other hand, this utility model provides a method for pulping paper made from cotton stalks, which includes the following steps:
[0020] Step 1: Use a multi-roller washing machine to dilute and wash the cotton stalks, and then use an inclined spiral dewatering machine to dewater the cotton stalks.
[0021] Step 2: After dehydration, the cotton stalks are fed into a screw extruder and a twin-screw filament mill in sequence, where the cotton stalks are torn and ground into loose cotton filaments.
[0022] Step 3: The cotton stalks first enter the hot spiral conveyor mechanism to raise the temperature of the cotton stalks to the enzymatic hydrolysis temperature, and then enter the mixing and lifting spiral conveyor mechanism. During the conveying and lifting process, the cotton stalks and enzyme preparation are mixed evenly.
[0023] Step 4: After mixing with the enzyme preparation, the cotton stalks and fibers enter the enzymatic hydrolysis reaction chamber to carry out the enzymatic hydrolysis reaction;
[0024] Step 5: After enzymatic hydrolysis, the cotton stalks and fibers are metered by the drum metering device, then enter the cooking tube mechanism for cooking, and finally enter the spray chamber for later use.
[0025] By employing the above technical solution, this utility model has at least the following advantages:
[0026] The screw extruder further dehydrates the cotton stalks to a dryness of 30-35%, meeting the feeding requirements of the twin-screw filament mill. The twin-screw filament mill performs coarse filament milling, tearing and grinding the cotton stalks into loose cotton stalk filaments with a length of 10-15mm and a thickness of 2-3mm. This greatly reduces the problems of difficulty in impregnation and softening and poor uniformity caused by the natural resistance of the cotton stalk bast fiber cell walls to biological enzymes. This makes the cotton stalks both conducive to the penetration of enzyme preparations to achieve the ideal effect of enzymatic hydrolysis of pectin and not too fine, making the cotton stalks suitable for feeding into the subsequent cooking system.
[0027] The cotton stalks processed by the twin-screw spun cotton stalk machine will reach a certain temperature under the action of the equipment's mechanical energy, basically reaching 35-40℃. The temperature required for enzymatic hydrolysis is 40-45℃. Therefore, a hot spiral conveyor mechanism is set up to adjust the temperature of the cotton stalks to the appropriate temperature for enzymatic hydrolysis in advance, so as to avoid direct contact between steam and enzyme preparation, which would cause enzyme inactivation. The amount of enzyme preparation added is 0.4-0.6% of the oven-dry cotton stalk weight.
[0028] The enzyme preparation is pectinase, a mixed preparation of enzymes that break down pectin, containing endo-polygalacturonase, endo-polygalacturonate methyl esterase, exo-polygalacturonase, and exo-polygalacturonate methyl esterase, etc.
[0029] To increase the contact rate between the enzyme and the straw tablets and improve the enzymatic hydrolysis efficiency, the straw tablet dryness during enzymatic hydrolysis is set at 23-26%, meaning that the enzyme preparation needs to be diluted to a specific ratio before being added to the mixture to lift the spiral.
[0030] Inside the enzymatic hydrolysis reaction chamber, the tissue structure of the cotton stalk flakes is further loosened under the action of enzymes; the degradation of most of the pectin and the loosening of the flake tissue structure significantly reduce the chemical and steam losses in the cooking and delignification unit; the traditional cotton stalk pulping process uses 16-18% alkali (relative to the dry weight of the cotton stalk) and 2-2.2 tons of steam per ton of pulp in the cooking process, while the pulping process using this utility model patent uses 10-12% alkali (relative to the dry weight of the cotton stalk) and 1.3-1.5 tons of steam per ton of pulp in the cooking process.
[0031] This system achieves a pectin removal rate of ≥95% from cotton stalk raw materials while reducing cellulose loss and increasing lignin removal. It solves the problems of difficult impregnation and softening, and poor uniformity caused by the natural resistance of cotton stalk bast fiber cell walls to biological enzymes. It also addresses the high COD and treatment costs of wastewater resulting from high-concentration NaOH in traditional high-concentration alkaline pulping, reducing pulping costs and resolving the problem of high pectin content in cotton stalk pulp affecting papermaking and paper quality. Attached Figure Description
[0032] Figure 1 A schematic diagram of a cotton stalk papermaking pulping system provided for an embodiment of this utility model;
[0033] Figure 2 This is a schematic diagram of the enzymatic hydrolysis reaction chamber;
[0034] Figure 3 for Figure 2 View from point BB;
[0035] Figure 4 This is an axial view of a twin-screw thread rolling machine.
[0036] Figure 5 This is a schematic diagram of the structure of a multi-roller grass washing machine;
[0037] Figure 6 This is a structural disassembly diagram of the cooking tube;
[0038] Figure 7 This is a side view of a screw extruder;
[0039] Figure 8 This is a top view of a screw extruder;
[0040] Figure 9 This is a top view of the feeding screw conveyor mechanism;
[0041] Figure 10 for Figure 1 Enlarged view of section A.
[0042] The reference numerals in the accompanying drawings include: 1. Screw extruder; 2. Twin-screw filament rolling mill; 3. Hot screw conveyor mechanism; 4. Mixing and lifting screw conveyor mechanism; 5. Enzymatic reaction chamber; 6. Enzyme preparation mixing tank; 7. Collecting screw conveyor mechanism; 8. Bucket elevator; 9. Feeding screw conveyor mechanism; 10. Cooking tube; 11. Unloader; 12. Spraying chamber; 1101. High-pressure water pipe; 1102. Cylinder; 1103. Agitator motor; 1001. Pipe body; 1002. Screw rod; 501. Bin body; 502. Chain plate; 503. Distribution roller; 13. Multi-roller hay washer. 14. Inclined spiral dewatering machine, 1301. Housing, 1302. Washing roller, 1303. Conical hopper, 1304. First switch valve, 1305. Slag collection cylinder, 1306. Second switch valve, 1307. Water injection pipe, 101. First housing, 102. Spiral rod, 201. Horizontal screw, 202. Vertical screw, 203. Thread rolling screw, 204. Steam pipeline, 15. Third housing, 901. Feeding spiral, 902. Alkali spray pipe, 16. Return spiral mechanism, 17. Pin drum metering device, 18. Pre-steaming spiral mechanism, 19. Enzyme preparation pump, 20. Detailed Implementation
[0043] To further illustrate the technical means and effects adopted by this utility model to achieve its intended purpose, the specific implementation methods, structures, features, and effects according to this utility model application are described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "embodiments" or "embodiments" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.
[0044] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.
[0045] like Figure 1 As shown, one embodiment of the present invention provides a cotton stalk papermaking pulping system, which includes: a material preparation section, an enzymatic hydrolysis section, and a cooking section;
[0046] The material preparation section includes a wet material preparation unit, a screw extruder 1, and a twin-screw wire rolling mill 2 connected in sequence;
[0047] The enzymatic hydrolysis section includes a hot spiral conveyor 3, a mixing and lifting spiral conveyor 4, and an enzymatic hydrolysis reaction chamber 5 connected in sequence. The mixing and lifting spiral conveyor 4 is connected to the enzyme preparation mixing tank 6.
[0048] The cooking section includes a material collection screw conveyor 7, a bucket elevator 8, a feeding screw conveyor 9, a cooking tube 10, a discharger 11, and a spray chamber 12, which are connected in sequence.
[0049] like Figure 10As shown, specifically, the upper end of the cylinder 1102 of the unloader 11 is connected to the outlet of the cooking tube 10 mechanism, the side wall of the cylinder 1102 of the unloader 11 is connected to the high-pressure water pipe 1101, and the lower end of the cylinder 1102 of the unloader 11 is connected to the spray chamber 12. A stirring motor 1103 is installed at the lower end of the cylinder 1102 of the unloader 11, which drives the stirring blades inside the cylinder 1102 to rotate, so that the cooked material in the unloader 11 is evenly diluted and conveyed to the spray chamber 12 under the impact of high-pressure water. The high-pressure water is the subsequent slurry washing liquid, which reduces the amount of wastewater treated by the system.
[0050] like Figure 6 As shown, specifically, the cooking tube 10 includes a tube body 1001 and a spiral rod 1002 inside the tube body 1001. The spiral rod 1002 adopts spiral blades with variable pitch and variable diameter, thereby increasing the volumetric efficiency of the material inside the tube body 1001 to 75%, thereby improving the processing efficiency of the cooking tube 10.
[0051] like Figure 2 and Figure 3 As shown, specifically, the enzymatic hydrolysis reaction chamber 5 includes a chamber body 501. The bottom of the chamber body 501 adopts an adjustable speed movable bottom chain plate 502 transmission structure. The working surface of the discharge end of the chain plate 502 transmission structure is provided with a material equalization roller 503 (the material equalization roller 503 includes a rotating shaft and multiple actuating rods fixedly connected to the side of the rotating shaft. The rotating shaft is rotatably connected to the opposite side wall of the chamber body 501. The rotating shaft drives the actuating rods to rotate, breaking up the enzymatic hydrolysis material on the working surface and preventing the material discharged from the chamber body 501 from clumping).
[0052] The structure of the enzymatic hydrolysis reaction chamber 5 can meet the time requirement of 4-4.5 hours for enzymatic hydrolysis. The surface of the chamber body 501 is covered with a heat insulation layer to ensure that the temperature drop of the cotton stalk material is within 2-4℃ within 4.5 hours under a certain filling coefficient, thus ensuring the smooth progress of the enzymatic hydrolysis reaction. The material distribution roller 503 can make the material in the enzymatic hydrolysis reaction chamber 5 uniform, ensuring the normal operation of the cooking and delignification unit.
[0053] like Figure 1 As shown, in a specific embodiment, the wet preparation unit includes a multi-roller grass washing machine 13 and an inclined spiral dewatering machine 14 connected in sequence.
[0054] like Figure 5 As shown, in this embodiment, specifically, the multi-roller grass washing machine 13 includes a housing 1301 and multiple grass washing rollers 1302. The multiple grass washing rollers 1302 are arranged horizontally in sequence inside the housing 1301. The upper end face of the housing 1301 has an inlet sidewall connected to a water injection pipe 1307. The lower end face of the housing 1301 has multiple conical buckets 1303 arranged in sequence. The lower ends of the conical buckets 1303 are connected in sequence to a first switching valve 1304, a slag collection cylinder 1305, and a second switching valve 1306.
[0055] Specifically, water is injected into the box 1301 through the water injection pipe 1307. At the same time, multiple grass washing rollers 1302 rotate in the same direction. Multiple actuating plates are evenly distributed on the shaft side of the grass washing rollers 1302, which drive the cotton stalks to be immersed in the washing water. In the water, the cotton stalks become loose and absorb water. After the heavy impurities are separated, they fall into the cone hopper 1303 and the slag collection cylinder 1305.
[0056] When the multi-roller grass washer 13 is working, the first switch valve 1304 is open and the second switch valve 1306 is closed, and heavy impurities are concentrated into the slag collection cylinder 1305; when slag is discharged, the first switch valve 1304 is closed and the second switch valve 1306 is opened, and the slag collection cylinder 1305 discharges slag. The slag discharge sequence and cycle are set manually and automatically according to the actual situation.
[0057] Specifically, the inclined screw dewatering machine 14 has a filter screen below the screw shaft. When the screw shaft drives the straw to move upward, the cotton stalks are continuously squeezed by the screw blades. The water overflowing from the cotton stalks flows downward along the filter screen and passes through the filter screen, thereby achieving dewatering of the cotton stalks and dewatering the 3-3.5% concentration cotton stalks to a dryness of 20-22%.
[0058] like Figure 7 and Figure 8 As shown, in a specific embodiment, the screw extruder 1 includes a first housing 101 and two screws 102 located inside the first housing 101. The direction from the material inlet of the first housing 101 to the material outlet of the first housing 101 is the first direction. Along the first direction, the diameter of the screw 102 gradually increases, the pitch of the screw blades of the screw 102 gradually decreases, and a first filter screen is provided below the screw 102.
[0059] In this embodiment, specifically, the diameter of the spiral rod 102 gradually increases, the pitch of the spiral blades gradually decreases, and as the spiral rod 102 rotates, the cotton stalk moves toward the material outlet of the first housing 101. At the same time, the volume of the space where the cotton stalk is located decreases, the squeezing pressure on the cotton stalk gradually increases, and the squeezed water passes through the first filter screen and is discharged from the drain outlet of the first housing 101, thereby further dehydrating the cotton stalk to a dryness of 30-35%.
[0060] Specifically, the first filter screen is fixedly installed inside the first housing 101 below the spiral rod 102.
[0061] like Figure 4 As shown, in a specific embodiment, the twin-screw wire rolling machine 2 includes a second housing 201 and two wire rolling screws 204 located inside the second housing 201. The feed channel of the second housing 201 is provided with a horizontal screw 202 and a vertical screw 203 in sequence. A second filter screen is provided below the wire rolling screws 204, and a drain outlet is provided below the second filter screen.
[0062] In this embodiment, specifically, the twin-screw shredder 2 performs coarse shredding, tearing and grinding the cotton stalks into loose cotton stalk filaments with a length of 10-15mm and a thickness of 2-3mm. This greatly reduces the problems of difficulty in impregnation and softening and poor uniformity caused by the natural resistance of the cotton stalk bast fiber cell walls to biological enzymes. This makes the cotton stalk filaments both conducive to the penetration of enzyme preparations to achieve the ideal effect of enzymatic hydrolysis of pectin and not too fine, making the cotton stalk filaments suitable for feeding into the subsequent continuous steaming system.
[0063] The cotton stalks processed by the twin-screw spun yarn machine will reach a certain temperature under the action of the mechanical energy of the equipment, basically reaching 35-40℃.
[0064] Specifically, the second filter screen is fixedly installed inside the second housing 201 below the thread rolling screw 204.
[0065] like Figure 1 As shown, in a specific embodiment, a steam pipeline 15 is also included. One end of the steam pipeline 15 is connected to the upper exhaust port of the spray chamber 12, and the other end is connected to the hot spiral conveying mechanism 3.
[0066] In this embodiment, specifically, the cooked cotton stalk flakes enter the spray chamber 12, and the residual heat steam in the spray chamber reaches the hot spiral conveyor 3 along the steam pipeline 15, thereby achieving the purpose of raising the temperature of the cotton stalk flakes by preheating through cooking, and meeting the temperature requirement of 40-45℃ for enzymatic hydrolysis of cotton stalk flakes.
[0067] like Figure 1 and Figure 9 As shown, in a specific embodiment, the feeding screw conveying mechanism 9 includes a third housing 901 and a feeding screw 902 located inside the third housing 901. A third filter screen is provided below the feeding screw 902. The drain outlet of the third housing 901 below the third filter screen is connected to the enzyme preparation mixing tank 6. The discharge port of the third housing 901 is connected to the inlet of the cooking tube 10 mechanism. The inlet of the cooking tube 10 mechanism is connected to the alkali spray pipe 16.
[0068] In this embodiment, specifically, the enzymatically hydrolyzed cotton stalk flakes enter the third housing 901 of the feeding screw conveyor mechanism 9. After being squeezed, the residual moisture flows into the enzyme preparation mixing tank 6 through the third filter screen. After increasing the dryness of the enzymatically hydrolyzed cotton stalk flakes, the cotton stalk flakes are mixed with alkaline solution and enter the cooking tube 10 mechanism. Because the cotton stalk flakes have been fully shredded and enzymatically hydrolyzed beforehand, the amount of alkali used in the cooking process is reduced, the dependence on high concentrations of alkali is reduced, and excessive COD in the wastewater is avoided.
[0069] Specifically, the solution in the enzyme preparation tank 6 is drained by the feeding screw conveyor 9, and this water contains residual enzyme components that have not fully reacted with pectin.
[0070] Specifically, the third filter screen is fixedly installed in the internal space of the third housing 901 below the feeding screw 902.
[0071] like Figure 1 As shown, in a specific embodiment, the cooking section also includes a return screw mechanism 17, a pin drum metering device 18, and a pre-steaming screw mechanism 19. The outlet of the bucket elevator 8 is connected to the inlet of the return screw mechanism 17, the middle outlet of the return screw mechanism 17 is connected to the inlet of the pin drum metering device 18, the end outlet of the return screw mechanism 17 is connected to the enzymatic reaction chamber 5, the outlet of the pin drum metering device 18 is connected to the inlet of the pre-steaming screw mechanism 19, and the outlet of the pre-steaming screw mechanism 19 is connected to the inlet of the feeding screw conveyor mechanism 9.
[0072] In this embodiment, specifically, because the amount of material conveyed by the bucket elevator 8 varies at different times, it is quantitatively measured by the pin drum meter 18, so that the subsequent cooking process volume tends to be stable.
[0073] The cotton stalk material output from the bucket elevator 8 enters the return screw mechanism 17, first flowing out through the middle outlet to the pin drum metering device 18. Excess cotton stalk material returns to the enzymatic reaction chamber 5 through the end outlet and inclined pipe. The preheating screw mechanism receives the material discharged from the pin drum metering device 18, which can make the cotton stalk material uniform and dense again, and stabilize the flow rate of the cotton stalk material again. This makes the degree of compression of the cotton stalk material by the feeding screw conveyor 9 tend to be stable, so that the dryness of the cotton stalk material before mixing with the alkali solution remains stable and controllable, thus facilitating the control of the cooking process parameters.
[0074] like Figure 1 As shown, in a specific embodiment, the enzymatic hydrolysis section also includes an enzyme preparation pump 20, the inlet of which is connected to the enzyme preparation mixing tank 6, and the outlet of which is connected to the mixing and lifting screw conveyor mechanism 4.
[0075] In this embodiment, specifically, the enzyme preparation pump 20 is a volumetric pump, which can avoid mechanical damage to the enzyme preparation components.
[0076] On the other hand, another embodiment of this utility model provides a method for pulping paper from cotton stalks, which includes the following steps:
[0077] Step 1: Use a multi-roller straw washing machine 13 to dilute and wash the cotton stalks, and then use an inclined spiral dewatering machine 14 to dewater the cotton stalks.
[0078] Step 2: After dehydration, the cotton stalks are fed into the screw extruder 1 and the twin-screw filament machine 2 in sequence, where the cotton stalks are torn and ground into loose cotton filaments.
[0079] Step 3: The cotton stalks first enter the hot spiral conveyor mechanism 3 to raise the temperature of the cotton stalks to the enzymatic hydrolysis temperature, and then enter the mixing and lifting spiral conveyor mechanism 4. During the conveying and lifting process, the cotton stalks and enzyme preparation are mixed evenly.
[0080] Step 4: After mixing with the enzyme preparation, the cotton stalks and fibers enter the enzymatic hydrolysis reaction chamber 5 to carry out the enzymatic hydrolysis reaction;
[0081] Step 5: After the enzymatically hydrolyzed cotton stalks are metered by the metering drum 18, they are then steamed in the cooking tube 10 and finally enter the spray chamber 12 for later use.
[0082] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.
Claims
1. A cotton stalk papermaking pulping system, characterized in that, include: The material preparation department includes a wet material preparation unit, a screw extruder, and a twin-screw wire rolling machine connected in sequence. The enzymatic hydrolysis section includes a hot spiral conveyor mechanism, a mixing and lifting spiral conveyor mechanism, and an enzymatic hydrolysis reaction chamber connected in sequence. The mixing and lifting spiral conveyor mechanism is connected to the enzyme preparation mixing tank. The cooking section includes a material collection screw conveyor, a bucket elevator, a feeding screw conveyor, a cooking tube mechanism, a discharger, and a spray bin, which are connected in sequence.
2. The cotton stalk papermaking pulping system according to claim 1, characterized in that, The wet preparation unit includes a multi-roller grass washer and an inclined spiral dewatering machine connected in sequence.
3. The cotton stalk papermaking pulping system according to claim 1, characterized in that, The screw extruder includes a first housing and two screws located inside the first housing. The direction from the material inlet of the first housing to the material outlet of the first housing is a first direction. Along the first direction, the diameter of the screws gradually increases, the pitch of the screw blades of the screws gradually decreases, and a first filter screen is provided below the screws.
4. The cotton stalk papermaking pulping system according to claim 1, characterized in that, The twin-screw wire rolling machine includes a second housing and two wire rolling screws located inside the second housing. The feed channel at the upper end of the second housing is provided with a horizontal screw and a vertical screw in sequence. A second filter screen is provided below the wire rolling screws, and a drain outlet is provided below the second filter screen.
5. The cotton stalk papermaking pulping system according to claim 1, characterized in that, It also includes a steam pipeline, one end of which is connected to the upper exhaust port of the spray chamber, and the other end is connected to the hot spiral conveyor mechanism.
6. The cotton stalk papermaking pulping system according to claim 1, characterized in that, The feeding screw conveying mechanism includes a third housing and a feeding screw located inside the third housing. A third filter screen is provided below the feeding screw. The drain outlet of the third housing below the third filter screen is connected to the enzyme preparation mixing tank. The discharge port of the third housing is connected to the inlet of the cooking tube mechanism. The inlet of the cooking tube mechanism is connected to the alkali spray pipe.
7. The cotton stalk papermaking pulping system according to claim 1, characterized in that, The cooking section also includes a return screw mechanism, a pin drum metering device, and a pre-steaming screw mechanism. The outlet of the bucket elevator is connected to the inlet of the return screw mechanism, the middle outlet of the return screw mechanism is connected to the inlet of the pin drum metering device, the end outlet of the return screw mechanism is connected to the enzymatic reaction chamber, the outlet of the pin drum metering device is connected to the inlet of the pre-steaming screw mechanism, and the outlet of the pre-steaming screw mechanism is connected to the inlet of the feeding screw conveyor mechanism.
8. The cotton stalk papermaking pulping system according to any one of claims 1 to 7, characterized in that, The enzymatic hydrolysis section also includes an enzyme preparation pump, the inlet of which is connected to the enzyme preparation mixing tank, and the outlet of which is connected to the mixing and lifting screw conveyor mechanism.